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 #include &quot;textedit.h&quot;
 #include &lt;QCompleter&gt;
 #include &lt;QKeyEvent&gt;
 #include &lt;QAbstractItemView&gt;
 #include &lt;QtDebug&gt;
 #include &lt;QApplication&gt;
 #include &lt;QModelIndex&gt;
 #include &lt;QAbstractItemModel&gt;
 #include &lt;QScrollBar&gt;

 TextEdit::TextEdit(QWidget *parent)
 : QTextEdit(parent), c(0)
 {
     setPlainText(tr(&quot;This TextEdit provides autocompletions for words that have more than&quot;
                     &quot; 3 characters. You can trigger autocompletion using &quot;) +
                     QKeySequence(&quot;Ctrl+E&quot;).toString(QKeySequence::NativeText));
 }

 TextEdit::~TextEdit()
 {
 }

 void TextEdit::setCompleter(QCompleter *completer)
 {
     if (c)
         QObject::disconnect(c, 0, this, 0);

     c = completer;

     if (!c)
         return;

     c-&gt;setWidget(this);
     c-&gt;setCompletionMode(QCompleter::PopupCompletion);
     c-&gt;setCaseSensitivity(Qt::CaseInsensitive);
     QObject::connect(c, SIGNAL(activated(const QString&amp;)),
                      this, SLOT(insertCompletion(const QString&amp;)));
 }

 QCompleter *TextEdit::completer() const
 {
     return c;
 }

 void TextEdit::insertCompletion(const QString&amp; completion)
 {
     if (c-&gt;widget() != this)
         return;
     QTextCursor tc = textCursor();
     int extra = completion.length() - c-&gt;completionPrefix().length();
     tc.movePosition(QTextCursor::Left);
     tc.movePosition(QTextCursor::EndOfWord);
     tc.insertText(completion.right(extra));
     setTextCursor(tc);
 }

 QString TextEdit::textUnderCursor() const
 {
     QTextCursor tc = textCursor();
     tc.select(QTextCursor::WordUnderCursor);
     return tc.selectedText();
 }

 void TextEdit::focusInEvent(QFocusEvent *e)
 {
     if (c)
         c-&gt;setWidget(this);
     QTextEdit::focusInEvent(e);
 }

 void TextEdit::keyPressEvent(QKeyEvent *e)
 {
     if (c &amp;&amp; c-&gt;popup()-&gt;isVisible()) {
         <span class="comment">//</span> The following keys are forwarded by the completer to the widget
        switch (e-&gt;key()) {
        case Qt::Key_Enter:
        case Qt::Key_Return:
        case Qt::Key_Escape:
        case Qt::Key_Tab:
        case Qt::Key_Backtab:
             e-&gt;ignore();
             return; <span class="comment">//</span> let the completer do default behavior
        default:
            break;
        }
     }

     bool isShortcut = ((e-&gt;modifiers() &amp; Qt::ControlModifier) &amp;&amp; e-&gt;key() == Qt::Key_E); <span class="comment">//</span> CTRL+E
     if (!c || !isShortcut) <span class="comment">//</span> dont process the shortcut when we have a completer
         QTextEdit::keyPressEvent(e);

     const bool ctrlOrShift = e-&gt;modifiers() &amp; (Qt::ControlModifier | Qt::ShiftModifier);
     if (!c || (ctrlOrShift &amp;&amp; e-&gt;text().isEmpty()))
         return;

     static QString eow(&quot;~!@#$%^&amp;*()_+{}|:\&quot;&lt;&gt;?,./;'[]\\-=&quot;); <span class="comment">//</span> end of word
     bool hasModifier = (e-&gt;modifiers() != Qt::NoModifier) &amp;&amp; !ctrlOrShift;
     QString completionPrefix = textUnderCursor();

     if (!isShortcut &amp;&amp; (hasModifier || e-&gt;text().isEmpty()|| completionPrefix.length() &lt; 3
                       || eow.contains(e-&gt;text().right(1)))) {
         c-&gt;popup()-&gt;hide();
         return;
     }

     if (completionPrefix != c-&gt;completionPrefix()) {
         c-&gt;setCompletionPrefix(completionPrefix);
         c-&gt;popup()-&gt;setCurrentIndex(c-&gt;completionModel()-&gt;index(0, 0));
     }
     QRect cr = cursorRect();
     cr.setWidth(c-&gt;popup()-&gt;sizeHintForColumn(0)
                 + c-&gt;popup()-&gt;verticalScrollBar()-&gt;sizeHint().width());
     c-&gt;complete(cr); <span class="comment">//</span> popup it up!
 }</pre>
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